math.h functions support

[manicpop]

Using build 101324-178.

Below is the status of the following math.h functions. These don't necessarily all need to be working if no modules use them, but I'm trying to be thorough as possible. I tested each one by hand with a few values, so this is far from an exhaustive test.

Of these, only pow() is non-functional and also used in Galactic Empire.

acos() -- works as intended (used in Galactic Empire)
asin() -- works as intended
atan() -- seems to return the input value as output, doesn't do anything, but doesn't crash
atan2() -- returns incorrect values, doesn't crash
cos() -- works as intended (used in Galactic Empire)
cosh() -- returns incorrect values, doesn't crash
sin() -- works as intended (used in Galactic Empire)
sinh() -- module crashes ('Unsupported OpCode: Fabs')
tan() -- module crashes ('Unsupported OpCode: Fsincos')
tanh() -- module crashes ('Unsupported OpCode: Fabs')
exp() -- seems to return the input value as output, doesn't do anything, but doesn't crash
frexp() -- module crashes ('Unsupported OpCode: Fxtract')
ldexp() -- works as intended
log() -- seems to fail silently, does not crash anything, module continues on as if nothing happened
log10() -- seems to return the input value as output, doesn't do anything, but doesn't crash
modf() -- works as intended (used in Galactic Empire)
pow() -- seems to handle integers fine, floating point values kick you out of the current module but it doesn't crash (used in Galactic Empire)
sqrt() -- works as intended (used in Galactic Empire)
ceil() -- works as intended
fabs() -- works as intended
floor() -- works as intended
fmod() -- module crashes ('Unsupported OpCode: Fprem')