Add MacOS support

[pkulchenko]

No description provided.

[pkulchenko]

Checked in initial batch of changes for MacOS compatibility:

• 048fd23 Updated menus to avoid conflicts with MacOS shortcuts
• 2627957 Updated logic creating menubar to make it work correctly on MacOS with special Help/About items
• 16b0ca0 Updated path handling to better detect how the app is started and to avoid loading dlls on non-windows platforms
• e3189ba Updated logic for detecting hostname (used in the debugger) to make sure it is resolvable
• ad48622 Fixed aborting running/debugged programs on MacOS by adding MAKE_GROUP_LEADER option to wxExecute

[pkulchenko]

More MacOS compatibility changes:

• 7b22410 Added refresh of filetree on MacOS to get it displayed correctly when the app is started
• fc6de03 Reorganized handling of font configuration and added font config for filetree (with a different size default on MacOS)
• 08d42a2 Removed setting the editor font in the config as the default font is different on different platforms
• 7d9ad51 Fixed markup styling and file tree drawing on MacOS
• 6bff634 Added explicit calls to CreateBitmap as wxArtProvider.GetBitmap doesn't alway call a custom art provider on MacOS (2.8.12) and in some cases on msWin (2.8.7)
• 3c6a06f Added setting of PATH and CPATH to find proper libs on windows and mac os platforms
• c2f6ed6 Removed extension from the template to match folders to make it more portable
• 3a5b46f Fixed an error thrown when a window with debugging is closed before the application being debugged is terminated

[pkulchenko]

Some of MacOS issues (using wxwidgets 2.8.12 and wxlua 2.8.12.2):

• (fixed; added single-click toggle); Double-click is not working on filetree folders.
• (fixed) Pressing Command-S when it is inactive in the menu causes 's' character to appear in the editor (issue Extra character appears in editor when pressing cmd-s on the Mac #19).
• (fixed) wxTreeCtrl:GetNextChild() doesn't work beyond one, which makes the filetree to close after activating a file and not to bold the file that is active in the editor (issue Current file is not activated in the project tree on Mac #29).
• (fixed; used EVT_LEFT_CLICK) Function dropdown is not populated; EVT_SET_FOCUS is not activated (http://trac.wxwidgets.org/ticket/9862).
• (fixed) Checkboxes don't work in Find/Replace dialogs (issue Checkboxes in Find/Replace dialogs don't react to clicks (OSX) #63)
• GetPixel() fails (http://trac.wxwidgets.org/ticket/4473).
• SetLogicalFunction() segfaults.
• Cursor key selection doesn't work in auto-complete lists (OSX only)
• Markup gets lost after Undo (Markup gets lost after Undo #59) (OSX and Linux)
• Right click works oddly on OSX (Right click works oddly on OSX #54)