Reduce allocations

[sharwell]

This change reduces the number of allocations which are required to execute HandleCompilationStart for the various analyzers. These calls are made many times while users are working in the IDE, so the benefits of this change are most visible there. The potential benefit is at least hundreds of allocations each time the user makes a change while typing in the editor.

Currently the work is complete for documentation and layout rules, and partially complete for the remaining rules.

[codecov-io]

Current coverage is 79.37%

Merging #1683 into master will increase coverage by +0.01% as of bc96df1

@@            master   #1683   diff @@
======================================
  Files          545     545       
  Stmts        32203   32316   +113
  Branches      8974    8975     +1
  Methods          0               
======================================
+ Hit          25557   25652    +95
- Partial       5211    5213     +2
- Missed        1435    1451    +16

Review entire Coverage Diff as of bc96df1

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[pdelvo]

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