Build and release automation

[phistep]

Let premake also emit a script (batch, bash w/ bash-on-windows or powershell) which automatically builds with VS and runs exe compressors on it.

Add options for synth (-s, --synth), screen resolution (-r, --resolution=720,1080), packers (-a, --all-packers, per default only run bep and latest kkrunchy) and include debug builds (-d, --debug). Place in $PROJECT/export/bin/build.sh and binaries in rt-$RES.exe, rt-$RES.$PACKER.min.exe and rt-$RES_debug.$PACKER.min.exe.