The assignment operator and copy constructors could be replaced with
their default implementations. The destrutor was also not needed since
it only executed the same action the default constructor would have
done.
This adds a new class which allows to create type safe resource handle
types. At the moment, the engine uses ints pretty much everywhere for
providing handles to resources created by the specific subsystems. Since
all ints are the same to the C/C++ typesystem it is perfectly legal to
pass a sound handle to the graphics API as a buffer handle which will
obviously cause issues.
This adds a new type called "ID" which is a wrapper class for a generic
handle but with added type safety. An instance of this class cannot be
passed to a function expecting another type of handle which provided
compile-time type safety for these APIs.
As an initial test I converted the game sound handles to this new type.
I already found a bug in the mainhall system thanks to this new type.
The mainhall used the game sound handles as sound instance handles which
probably meant that that specific code never really worked right. I
removed the code since there was no better alternative for fixing it.
Changes a few windows (tech room, campaign room, medal case, and HUD config menu) to issue Warnings instead of Errors if certain pieces of interface art are missing. If their mask bitmap is missing, they automatically close themselves and display the old "Sorry, this feature is available only in the retail version" popup from the demo, allowing FSO to run the demo data without crashing when you click on the wrong button.
It also restores the special demo popup for the campaign room, which allows you to at least restart the demo campaign without deleting and recreating your pilot.
Initialization of the medal window locks the mask twice (once directly and once indirectly, through set_mask_bmap()), then closing the medal window tries to release it after only unlocking it once. bm_release() will refuse to do anything if the BMPMAN entry is still locked, though, so the first release therefore does nothing, and since it will then only be released once (indirectly, by Medals_window.destroy()) after being loaded twice, the mask stays loaded in memory until FSO exits. By moving the release until after Medals_window is destroyed, the mask should be successfully released when the medals window closes.
This allows to use standard TrueType Fonts for text rendering in FSO. It uses the NanoVG library which provides the ability of drawing 2D shapes. This library is used for most 2D operations now and can also be used directly by using the PathRenderer class.
MASSIVE thanks to Mjn.Mixael and Blue Planet for tireless constant testing.
(It's still not perfect, but it probably wouldn't be where it is at without them)
Spans a lot from initial commit to AP Branch in r6835.
git-svn-id: svn://svn.icculus.org/fs2open/trunk@9561 387891d4-d844-0410-90c0-e4c51a9137d3
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