Initial signature help work for tagged templates.
Merge branch 'master' into taggedSigHelp
Merge branch 'master' into taggedSigHelp
Stylistic changes/comment fixups.
Merge branch 'master' into taggedSigHelp
Got sig help working in the template head.
Got sig help working in tagged no-sub templates.
Merge branch 'master' into taggedSigHelp
Refactored code, adjusted for residing out of bounds of the template.
Fixed isUnclosedTemplateLiteral to account for new possible inputs.
Merge branch 'master' into taggedSigHelp

Conflicts:
	src/services/signatureHelp.ts
Fixed template head offsetting.
Tests for signature help on tagged templates with no overloads.
Added tests for overloads.
Merge branch 'master' into taggedSigHelp
Fixed broken test.
Paramter -> Parameter
getCallLikeInvoker -> getInvokedExpression
Addressed some CR feedback.
Added test.