Adds basic info on mac support.
Merge pull request #25 from gradha/pr_adds_basic_info_on_mac_support

Adds basic info on mac support.
Fixed calling convention problems on Windows. Fixed #24.
Apply the cdecl call convention more conservatively.
Fixed a segfault when the Close button in the about dialog box is clicked.
Fixed Error List in release mode.
Replaced most error dialogs with a message in the status bar.
Sexier unsaved file close confirmation dialog.
Fixed a crash when navigating to an error outside the bounds of the
available text in a tab.
Added a shortcut to open Aporia's config file in Aporia.
Syntax highlighting for any tab can now be changed from the View menu.
Every compiler execution is now done asynchronously, including suggest and Go to definition.
Fixed a crash when closing the last tab.
Fixed crash when compiling files.
Error list now gets full file paths from the compiler.
Fixed #26
Improved suggest by making it aware of project files.
Suggest works on unsaved files now.
Status bar message doesn't get overriden by processes.nim anymore.
Suggest can now be activated by pressing Ctrl + Space.
Added UTF-16LE/BE support.