Merge pull request prusa3d#2253 from mkbel/increase_version

Increase version.

v3.8.0 for MK3 and MK2.5

Increase version to 3.8.0-RC2 and build number to 2639.

v3.8.0-RC1 for MK3 and MK2.5

v3.7.3 for MK3 and MK2.5

Increase version.

Increase version.

Merge pull request prusa3d#1891 from mkbel/MK2

Increase version due to missing "stop" immediately after "pause" patc…

Merge pull request prusa3d#1890 from mkbel/MK2

Update FW_version string to final.

v3.7.1 for MK3 and MK2.5