TRY EXCEPT FINALLY from 5.0

[bhirsz]

Robot Framework 5.0 introduce new syntax: TRY EXCEPT blocks. We need to handle them.

Things to consider:

1. ~~Other rules should be able to access TRY, EXCEPT, FINALLY, ELSE blocks.~~ (#574)
2. ~~Warn when trying to use this syntax as keyword name (Try, Except, finally..)~~ (#570).
3. Special rules?
4. ~~Parsing errors - multiple FINALLY, EXCEPT blocks, wrong order (EXCEPT -> TRY, TRY -> FINALLY -> EXCEPT)~~

[bhirsz]

I will take care of 2)

[bhirsz]

Regarding 1. I'm going over the rules and updating the test. Going by the order of the rules in directories - if skipped rule, it means it doesn't need update for RF5. Updated so far:

• missing-space-after-comment
• invalid-for-loop
• invalid-if
• missing-keyword-name
• if-can-be-merged
• bad-indent
• misaligned-continuation