replace llinfos, lldebugs, etc with new LL_INFOS(), LL_DEBUGS(), etc.

CHUI-487, CHUI-488 W.I.P. #1 (Enable flashing FUI button behavior and Implement Flashing Conversations panel line item behavior): build new class LLFlashTimer based on LLSysWellChiclet::FlashToLitTimer; prepared it for general purpose; replaced LLSysWellChiclet::FlashToLitTimer to LLFlashTimer

Set UnreadIMs icon to visible if messages were sent while offline.

CHUI-337 FIXED: To avoid confusion with a classes "...conversation..." and in accordance with the naming convention in the project, some classes and corresponding files should be renamed:
LLIMConversation -> LLFloaterIMSessionTab
LLIMFloater -> LLFloaterIMSession
LLNearbyChat -> LLFloaterIMNearbyChat
LLIMFloaterContainer -> LLFloaterIMContainer
LLNearbyChatBarListener -> LLFloaterIMNearbyChatListener
LLNearbyChatHandler -> LLFloaterIMNearbyChatHandler

CHUI-380: Final commit for this issue. After code review changed some method names to be more accurate. Also using dynamic_cast instead of static_cast for safety.

CHUI-380: (In progress) Refactoring needed to fix focusing issues when selecting an existing conversation item. This commit resolves re-introducing bug CHUI-289. Will code review and cleanup code in next commit.

Fixed boost trackable objects usage.

phase 2, removal of extraneous signaling in favor of llnotificationchannels
made notificationchannels work better with overrides and lifetime managed
by creator

changed ordering of template loading relative to constructor setting of params
moved a lot of constructor-set params to template files
reviewed by Leslie

made LLDefaultChildRegistry::Register errors actually crash the client...llerrs doesn't work in static initializers

 - moved the common code (menu stuff handling) from LLIMP2PChiclet, LLAdHocChiclet, LLIMGroupChiclet to their parent LLIMChiclet
 - added popup menus to LLInvOfferChiclet and LLScriptChiclet (notice that just the closing menu item was added because these chiclets are not connected with IM sessions.)
Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/254/

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Made flashing count and period for IM Well and Notification Well icons configurable via viewer settings: WellIconFlashCount, WellIconFlashPeriod.
Due to Flash Timer is implemented as derived class from EventTimer it is impossible to change period in runtime. So, both settings are made as required restart.

Also removed deprecated "flash_to_lit_count" & "flash_period" widget params.

Reviewed by Vadim at https://codereview.productengine.com/secondlife/r/220/

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Checker: REVERSE_INULL
Function: LLChicletPanel::findChiclet<LLIMChiclet>(const LLUUID &)
File: /indra/newview/llchiclet.h

Handling of mouseDown event was delegated to chiclet's button.
Also double callback was connected with onMouseDown handler to ride from missed click behavior.

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added destroying chiclet on chiclet panel item remove event;
made LLIMChiclet destructor virtual;

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fixed bug EXT-3722  New IM & Notification buttons can be clicked on, even when there's nothing to see
Note:
It was decided to  handle  an enabling of buttons from syswellwindow according to his empty state

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Update for low task EXT-3451 - Code cleanup: Get Rid of Magic constants in LLChicletPanel::Params::Params (move into widget xml).
Removed hardcodes.

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"show session" enabled when chiclet window is visible).

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fix for  EXT-2881 Enough space to place 5 chiclets without arrows in bottom bar when voice indicator isn't shown

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fix for low  Task EXT-2881 Enough space to place 5 chiclets without arrows in bottom bar when voice indicator isn't shown
change whole chicklet arranging.

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implemented major task (EXT-3354) Add "unread message" counters for IM sessions in the IM well window

- IM Well Window's chiclets now have counters and count IMs from 1 to "99+"
- IM Well Window's items can resize on appearance of chiclet's counter or speaker indicator

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