Tcl: support eval/catch commands

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extra : rebase_source : 5d7e3a2b3c549419c672cddd8d780542053d68bb
Tcl: support switch command

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extra : rebase_source : f516669986006db5aca6af6417f323e57fa848d1
Tcl: refactor similar code into tcl_codify_token function

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extra : rebase_source : 71a597ee1427c9ee52d8879ffc360f91912f8561
Tcl: correct namespace resolution in case of INLINE_SOURCES = YES
Tcl: test 057 additionally tests mutual Xrefs for two files
Tcl: add missing file that breaks test 057
Merge pull request #189 from wtschueller/master

Support more Tcl commands