Fixed flags

Closes #3 (closed), #24 (closed)

Moved IntegerRegister in register.py to its own file. Removed the Flag class and made the flags into integer registers instead. Made the L-flag be just a signal and put the "register" part in the loop counter instead (this is how it works in MIA).

Finally, added a rudimentary signal viewer class in the GUI to visualise the L-flag. Currently the signal viewer lacks functionality such sa locking itself in place and having its position saved to and loaded from a layout.

requested review from @marho227

approved this merge request

added 18 commits

• 798f8938...367efa82 - 17 commits from branch main
• e3951f86 - Merge with main

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reset approvals from @marho227 by pushing to the branch

mentioned in commit b6c3f98f

merged