Improve live templates

[ducky64]

Major refactoring for insertion live template infrastructure:

• InsertionLiveTemplate now manages the entire template lifecycle, from AST creation (which the user must subclass and implement), deletion (to support a larger variety of AST changes), and optional clean-on-completion or cancelation hooks
  • Refactor AST creation code into these
  • Eliminate the prior hack-tastic deleteTemplate - up to the InsertionLiveTemplate subclass to store the AST nodes to delete, no longer inferred by infrastructure
• The API now takes a container, optionally specific elements for the template (e.g. if only adding to an argument list), and variables (compared to only container before, where the change had to be a unitary PsiElement)
• Prevent multiple templates from starting, InsertionLiveTemplate.run returns Errorable
• Better selection of insertion position at caret, in particular works better when selecting comments (prior, it required inserting at a statement)
• When cleaning fails, log errors to the console
• MovableLiveTemplate: store variable values by name when moving, and store position by name - allows robustness when the template variables change as they are moved
• MovableLiveTemplate: explicitly finish the template before starting a new one, instead of relying on .update()

Improve block diagram visualization robustness:

• Support ALLOCATE in parsing constraints: instead of matching Ref.unapply, take the first two steps and getName on them
• Support new names for link ports (controller, targets) in infer edge direction
• Better support for longer prefixes in block diagram transforms

Connection Live Template:

• ConnectBuilder: support LibElem, since the new fast path won't build out all the ports
• Connect execution (connect live template, IR transform) now takes in the aggregate list of connected ports, and figures out what to do with them
  • Not distinguishing a starting port makes sense, since the starting port may be the one being appended to a link

Other refactoring:

• Define isInternal in EdgirUtils and refactor to use this function, to determine when to deprioritize (for UI purposes) items
• Prevent insertion of categories (insertion live template only)