Add options to Compiler()

[Minmin Gong]

Enable to have options for compiling shader.

Consider adding some options like these:

• Zpc: Packs matrices in column-major order by deafult
• Zpr: Packs matrices in row-major order by deafult
• enable-16bit-types: Half, int16_t, etc
• O{|0|1|2|3}: Optmization levels
• Zi: Debug info
• ShaderModel: Assign a shader model