LT-22165 HC does not handle multiple compounds in a row

[AndyBlack]

This solution adds two items to the Hermit Crab parser parameters:

1. Adds a MaxRoots parameter to the HC section
2. Adds a button "Set max applications of HC Compound rules"
   When the button is clicked, it brings up a dialog showing all compound rules (whether active or not) and the number of times each can be applied. The user can choose to set the number for a given rule to any digit from 1 to 9.

When producing the input for HC, the maximum number of applications allowed for each rule is set to the remembered value. When a rule has more than one application, we use the rule's GUID in the parser parameters to record the number of applications allowed.

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This change is 

[jasonleenaylor]

Src/LexText/ParserCore/HCParser.cs line 146 at r1 (raw file):

			int delReapps = 0;
			int maxStemCount = 2;

As an outsider I don't know why MaxRoots is between 2 and 10. Is this a decision that should be commented in this PR or is this just understood by parser domain experts?

[AndyBlack]

It should be understood by domain experts, but I added some comments anyway and pushed them.
Ah, I also needed to change it to allow for MaxRoots to be 1.

[jasonleenaylor]

Reviewed 10 of 10 files at r1, 1 of 2 files at r2, 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @AndyBlack)