STORM-284 FIXED Disabled "+" sign when user tries to drop a landmark to Favorites bar from any location besides My Inventory or Library.

* Bump CacheNumberOfRegionsForObjects up to 20k in the default settings.
* Make LLVOCache *actually* use this setting, with no upper bound.

Reviewed with Kelly.

- Added checking whether panel is in visible chain instead of just visibility checking

- Changed text_readonly_color in script editor to darker gray, so that line numbers are visible when scrip editor is out of focus.

STORM-194 FIXED 'Show' button in inventory offer notification to open 'My Inventory' SP if attachments were offered.
Removed the check preventing inventory SP from opening when an item of IT_ATTACHMENT type has been offered.

STORM-536 ADDITIONAL FIX Replaced extra calls to getChild() with using a member pointer to LLAccordionCtrlTabHeader.

STORM-536 FIXED scrolling to collapsed accordion tab with keyboard arrows in Places SP->My Landmarks.
- Fixed scrolling to selected item when a folder view receives selection inside an accordion tab while being out of visible scrolling area.
- Fixed scrolling to collapsed accordion tab when it receives selection while being out of visible scrolling area.