This adds constants to projects build via Godot Mono which allows project to conditionally react to different operating systems and 32/64 Bit architecture. Additionally .NET libraries could support multiple engines like Unity and Godot at the same time when compiled from Godot and reacting to definitions.
- Move "Mono" popup menu from the top right corner to `Projects -> Tools` as a submenu.
- Add "Build solution" button to the top right corner. Makes it more visible and quicker to access.
- Fix build list in the bottom panel unselect an item when clicking on empty space. Previously it would hide the issues panel but the item would remain selected, making it impossible to display the issues panel again if there was only one item.
Previously this was only done when building the script for running the game. This was a problem because the user could want to build the project manually with the "Build project" button, to then run the game from the command line or similar.
- thread_local.h: 'delegating constructors only available with -std=c++11 or -std=gnu++11'
- mono_reg_utils.cpp: 'extra tokens at end of #endif directive'
- mono_bottom_panel.cpp: '<fieldB> will be initialized after <fieldA> when initialized here'
- bindings_generator.cpp: 'name lookup of 'i' changed (...) matches this 'i' under ISO standard rules (...) matches this 'i' under old rules (...)'
When a Reference managed instance is garbage collected and its finalizer is called, it could happen that the native instance is referenced once again before the finalizer can unreference and memdelete it. The workaround is to create a new managed instance when this happens (at least for now).
Using `misc/scripts/fix_headers.py` on all Godot files.
Some missing header guards were added, and the header inclusion order
was fixed in the Bullet module.
