[EGD-5609] Fix lfs partition erase size bug

Storing LFS erase size in the boot byte is not possible
because Linux kernel is unable to detect the partitions
after change boot bytes to values other than 0x80 or 0x00

In this patch LFS_BLOCK_SIZE is moved to the second
MBR bootcode AREA

[EGD-5590] Fix boot config procedure

Boot config procedure was outdated and didn't actually work

[EGD-4495] Check partitions during registering new disk image

Check partitions validity when registering disk.
Add unittest and test disk image generation.

[EGD-5596] Fix fread() handling of EOF

iosyscalls' fread() should interpret zero bytes read as EOF.

[EGD-5522] Remount fs R/W for backup or update

After setting vFAT to be read only by default backup,
update and factory reset procedures need to remount R/W
first.

[EGD-4761] Add unit tests for littlefs and dual-mount

Additionally, old tests have been refactored for consistency
and readability. Also, files were added to littlefs test image.

[EGD-5463] Fix CI emulator log and timeout

Fix wrong log stream redirection in CI
Use real value from --timeout option and seto it to 30s
so emulator have enough time to start properly

[EGD-5515] Remove unused code lfxextension

Remove unused code for detecting block size from user blocks

[EGD-5266] Fix test harness

Covers harness issues that occures on experimental branch
due to the new filesystem implementation.

[EGD-5460] Fix "can't open port" on CI

This little fix should resolve one of the problems during tests on CI.

[EGD-5439] Fix compile after merge from master

Fix compile after merge from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5347] Replace filelength with file_size

Replace use of filelenght with std::filesystem::file_size
sqlite3vfs is using file descriptors so filelength is just renamed

[EGD-5378] Fix missing condition

Some strange mistake happened during a rebase.

[EGD-5072] Refactor legacy VFS functions

Functions were refactored and renamed for better readability.
Some of them were moved to different files. In stat_vfs function
the order of member initializations was corrected.

[EGD-5386] Fix tests in event table

Fix leap year handling in events table entry creation
Set hours/minutes during events table entry creation

[EGD-5392] Add switch vfat to RO mode

VFAT partition should be mounted in RO mode by default
because writing to FAT filesystem is unsafe.
Writing is allowed only in the LFS filesystem.
If upgrade is needed FAT partition can be temporary
switched to RW mode using mount() syscall with REMOUNT flag
but it should be switched to RO mode again after upgrade.

[EGD-5378] Add informative message before aborting iosyscalls

This fix gives basic information about missing syscalls
before aborting from libiosyscalls preload.

[EGD-5385] Fix unallowed use of ff_rename

Fix unallowed use of ff_rename FFAT function

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master