Update to 0.9.25 and support rotation on rM 2

• Applies all changes from the official update 0.9.25
• rM 2: Fixes the remaining problems with swtfb. The built-in client is now enabled by default and can be disabled by setting the env PLATO_DISABLE_BUILTIN_SWTFB_CLIENT=yes.
• rM 2: Added software based rotation for the rM 2. The rM 1 continues to rotate the entire eink screen which is most likely a bit faster.
• Updated to libremarkable 0.6.0 (with a minor patch to keep hw based rotation on the rM 1).

Known bugs:

• Opening a document, rotating and quitting out of it rotates back to the state before opening the document. This was present a long time on the rM 1 with its rotation as well and I didn't attempt to fix it here. Best to rotate in the home view to avoid this.
• Rotation will not work then the builtin swtfb client is disabled by the env as mentioned above.