Exclude Latexian temp files for Tex documents

Latexian adds some additional temporary files, which are not required for building the project. Therefore they are better left out as well

TeX.gitignore

@@ -154,3 +154,6 @@ pythontex-files-*/
 # endfloat
 *.ttt
 *.fff
+
+# Latexian
+TSWLatexianTemp*