ISO Loader 0.8.x Beta + preview of DreamShell v4.0 RC 5

[SWAT]

Update: https://github.com/DC-SWAT/DreamShell/re...0.0RC5-T15

I worked a lot on stability and finally understood the reason for random crashes.
Issue is in the G1 DMA conflict with other subsystems.
Therefore, for the time being, I switched the core to PIO mode, for it this is an imperceptible transition, but there is much more stability.
And I recommend use updated bootloader if you have some undefined behavior.

I finally fixed the VMU emulation, thanks to the help of megavolt85, now it works!
You can keep the physical VMU too if you want to use the LCD screen, but data will be lost on it.
It's still experimental feature, but it should works in most KATANA and also WinCE games, need tests. Homebrew not supported yet.
To use it, make VMU dump in VMU manager app and enable this feature in ISO Loader with number of VMU dump you want to use.
Dumps can be placed in /DS/vmu and /vmu directories. Still need improve UI for selecting without typing.

While solving VMU issues, I found a way to place the heap in a new place - the buffer for the Maple bus DMA in games.
There is has a free space if there are not many connected devices. It is even enough for CDDA with IRQ enabled.
It's good for compatibility if you can't place loader at 0x8c000100 and/or uses a full loader (with screenshot and vmu features) and CDDA.

I also discovered the possibility to add support for CDDA without IRQ enabled for homebrew games, although I have not tested this, but in theory it should work.

Some minor fixes and improvements have also been made, now use experience should be better!