Asset subsystem

[DCNick3]

Need to implement a generic way to bundle non-executable data with the program. Probably will need several back-ends for different platforms (put to data/other section on Linux, as the load is on demand; use romfs for libnx/Atmosphere)

What it can be used for:

• embedding localization data (like encoding mapping tables or locale information)
• embedding the target executable file, dlls and their resources (for the ease of distribution)
• embedding the ICU data (if we will stick with it)
• etc