Invalid string fix, UnduplicateString Fixed

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Deleted 'search up' option

hahaha
fixed "00" -> 0 bug. (Lua related)

lua_tointeger auto-converts string to integer, so I used lua_type to
explicitly check type of number.
License, v120_xp, search seperated to function

License for TrigEditPlus itself. (MIT)
Changed toolset to v120_xp.
Search function is seperated to ProcessSearchMessage().
Merge branch 'release6' into develop