Release 1.15.5

# Cemu detailed changelog for 1.15.5c
# Patreon release date: 2019-04-19
# Public release date:  2019-04-26

# New in 1.15.5c:

coreinit: Tweaked MEM2 heap size as some games expect system RPLs to occupy a certain amount of available memory (#48)

# New in 1.15.5b:

GX2: Fixed bug in framebuffer creation

# New in 1.15.5:

general: Added option to remember window positions
general: Added filter option to graphic pack window
general: Updated game profiles

CPU/JIT: New implementations for FRES and FRSQRTE with much higher accuracy (#3)
CPU/JIT: Added implementations for PS_CMPU0 and PS_CMPU1

GX2: Use floats instead of integers for viewport to match GPU7 hardware more closely
GX2: Avoid calling glClearTexImage on Nvidia due to extremly bad performance (clearing a 4K texture could take up to 50ms CPU time)
GX2: Fixed random crash that could occur with cache accuracy on high
GX2: Fixed incorrect viewport size calculation when resized by graphic packs
GX2: Reverted GX2ConvertDepthBufferToTextureSurface() change from 1.15.4 since it broke other games (#37)

H264: CheckDecunitlength() no longer requires valid PPS/SPS (fixes crash/softlock in Tank! Tank! Tank!)

Note:
(#xx) refers to bug tracker issues fixed by this change. See http://bugs.cemu.info/projects/cemu/