Implement request #71571: XSLT processor should provide option to change maxDepth (#13731)

There are two depth limiting parameters for XSLT templates.
1) maxTemplateDepth
This cor

Implement request #71571: XSLT processor should provide option to change maxDepth (#13731)

There are two depth limiting parameters for XSLT templates.
1) maxTemplateDepth
This corresponds to the recursion depth of a template. For very
complicated templates this can be hit.
2) maxTemplateVars
This is the total number of live variables. When using recursive
templates with lots of parameters you can hit this limit.

This patch introduces two new properties to XSLTProcessor that
corresponds to the above variables.

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