Update crash handler

[mcspr]

• limit recorder stack size by 128 bytes (if we crash from sys context, size is ~4Kb. just pre-calculate it even before writing anything). additional 2 bytes used in eeprom to store it
• offset settings a bit more
• add possibility to disable storing both crash info and trace. To disable just trace, sysTraceMax can be set to 0. sysSaveCrash check is placed at the start of the crash callback.

Some general updates to comments.
Writer loop now uses the same logic as reader, shifting by address size and writing 32 bit value all at once.