Add support for custom boot entries (either vWii or Wiiu)

[razor85]

Allows adding custom boot entries by creating a file called bootOptions.cfg in the :sd/wiiu/environments/tiramisu/ folder.
An example of such file is:

Nintendont,0x57574e44,vWii
WiiUChat,0xA,wiiu

The above configuration will display two new entries in the boot menu:

• "Nintendont" (titleId 0x57574e44, vWii Channel)
• "WiiUChat" (titleId 0xA, WiiU Channel)

I didn't do anything to support scrolling entries but I think that might be too much.

[Maschell]

Thanks for your Pull Request! I'll take a deeper look at this later, but here a few things I noticed:

• bootWiiuTitle (getVWiiTitleId... and friends) should not take a string, but the uint64_t as a parameter. The parsing should only be tied to the config loading.
• Using streams will bloat the binary without gaining that much readablity. Please use strtol instead!
• Do all vWii titles always start with 0x00010001. I actually have no idea. I would just always provide the full title id. With the full title id you can also get rid of the "vWii" vs "wiiu" part, looking at the titleId is enough

[razor85]

Thanks for your comments. The full title id is indeed a good idea and cleans up a bunch of code.
About the streams, I didn't know they would really make a big difference but seeing the binary size now, it almost doubled.
I will also clang-format clean it.

[razor85]

Gave another thought about it (sorry busy days) and was wondering if I indeed could get rid of the wiiu/vwii setting. It appears to me vWii titles are loaded through mocha and then CMPTLaunchTitle whilst wiiu titles are loaded via _SYSLaunchTitleWithStdArgsInNoSplash. Is this correct?