Rename package from 'nw' to 'novelwriter' (#868)

* Rename nw folder to novelwriter
* Rename nw to novelwriter in auxiliary files
* Rename nw to novelwriter in main app source
* Rename nw to novelwriter in tests
* Make setup script for pdf docs less spammy

novelwriter/assets/themes/syntax/tomorrow_night.conf

@@ -0,0 +1,45 @@
+##
+# Theme:  Tomorrow Night
+# Source: https://github.com/chriskempson/tomorrow-theme
+# Credit: Chris Kempson
+##
+# Colours:
+# Background   = 1d1f21 :  29,  31,  33
+# Current Line = 282a2e :  40,  42,  46
+# Selection    = 373b41 :  55,  59.  65
+# Foreground   = c5c8c6 : 197, 200, 198
+# Comment      = 969896 : 150, 152, 150
+# Red          = cc6666 : 204, 102, 102
+# Orange       = de935f : 222, 147,  95
+# Yellow       = f0c674 : 240, 198, 116
+# Green        = b5bd68 : 181, 189, 104
+# Aqua         = 8abeb7 : 138, 190, 183
+# Blue         = 81a2be : 129, 162, 190
+# Purple       = b294bb : 178, 148, 187
+##
+
+[Main]
+name       = Tomorrow Night
+author     = Veronica Berglyd Olsen (adaptation)
+credit     = Chris Kempson (color theme)
+url        = https://github.com/chriskempson/tomorrow-theme
+license    = MIT License
+licenseurl = https://github.com/chriskempson/tomorrow-theme/blob/master/LICENSE.md
+
+[Syntax]
+background     =  29,  31,  33
+text           = 197, 200, 198
+link           = 129, 162, 190
+headertext     = 129, 162, 190
+headertag      = 129, 162, 190
+emphasis       = 222, 147,  95
+straightquotes = 204, 102, 102
+doublequotes   = 181, 189, 104
+singlequotes   = 240, 198, 116
+hidden         = 150, 152, 150
+keyword        = 204, 102, 102
+value          = 178, 148, 187
+spellcheckline = 204, 102, 102
+errorline      = 181, 189, 104
+replacetag     = 138, 190, 183
+modifier       = 222, 147,  95