Speculative bunch of robustification.
Reviewed by Soft.

Changes:
- Added support for formatting day of the month without leading zero ("sday").
- Changed date format in place profile (landmark info) and in the top status bar
  according to bug reporter's request.

Technical details:
Actually implementation of strftime() in Linux and Windows supports stripping the
leading zero (with "%-d" and "%#d" respectively).
But that's not supported in MacOSX, so I had to reimplement it.

Reviewed by Sergey Litovchuk at https://codereview.productengine.com/secondlife/r/842/

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Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/836/

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Restored changeset which was lost after merge 58571b4e704b.

Reviewed by Neal Orman at https://codereview.productengine.com/secondlife/r/780/

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EXT-8550 DONE Rewrite "You [ACTION] a [RESOLUTION] baked texture for '[BODYREGION]' after [TIME] seconds." for localization

Split this into two messages to take out ACTION as requested.

Convert formatted date from system charset to UTF-8 on Windows (other OSes don't require this).

See http://jira.secondlife.com/browse/EXT-8318 for more details.

Reviewed by Sergey Litovchuk at https://codereview.productengine.com/secondlife/r/834/

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The panel_layout itself was taking focus by default (hmm).

Encapsulated building of the cache filename into a help function to prevent code
 duplication.

Reviewed by Tofu.

EXT-8284 FIXED ('Add More' panel items aren't sorted by clothing type after it was opened by 'Replace' item of context menu)

Restored from BAD MERGE at 5b5cc4a8642d

Reviewed by Neal Orman at https://codereview.productengine.com/secondlife/r/750/

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branch : product-engine

and     EXT-7397: decoding textures get stuck in REQ status

EXT-8534 FIXED Fixed the 'Wear' in My Outfits being disabled for outfits consisting of body parts only.

Changed the condition to enable the "Wear" button in My Outfits and the corresponding item in the outfit context menu.
They now get enabled for any outfit that isn't the base outfit and contains non-worn wearables.

By the way, did a minor cleanup: moved an LLAgentWearables.isCOFChangeInProgress() call to LLAppearanceMgr::getCanAddToCOF() to avoid code duplication.

Reviewed by Sergey Litovchuk at https://codereview.productengine.com/secondlife/r/832/

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