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.
It defaults to an empty string (resulting in no music) anyway, so there's no harm in it being missing, and the demo's mainhall.tbl doesn't contain these lines, so this change makes it possible to reach the mainhall with demo data.
cmission.main_hall defaults to an empty string, so calling main_hall_init() with an empty string is neither unsurprising nor uncommon. Since it's not actually caused by bad data, the warning can be considered actively harmful by training users that sometimes FSO just gives you a pointless warning.
The codebase had quite a few instances of .size() being called and then checked to see if it was 0 or not (or less than 1, or greater-than-or-equal-to 1, which are basically equivalent), when .empty() could be called instead (negated or not, depending on what the original condition was).
tech_render_anim did not check whether there were any intel/weapon
entries before trying to read from Current_list, which means that it
read at Current_list[-1], which is a Bad Thing (TM).
Do not try to render an anim if there is no entry.
This introduces a new mechanism for handling bit flags. Instead of using an int (or two, or three) to write bits into, this uses the std::bitset in a wrapper class that accepts an enum class as input. This means that certain classes of errors we've had a few of in the engine, where a coder used the wrong set of flags or checked them against the wrong variable (SF_STEALTH vs SIF_STEALTH, for example) can now be detected at a compiler level rather than not at all.
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.
Handle total_time directly requested from bm_load_animation
Make generic_anims request total_time directly
Move png-vs-apng check to apng class
Remove redundancy in apng exception messages
Update comments
Remove support for the IPX protocol. The IPX selector button in the multi
options menu is now hidden, and the TCP button is disabled since there is no other option.
MageKing17