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/gui/solarized_light/theme.conf

@@ -0,0 +1,28 @@
+[Main]
+name       = Solarized Light
+author     = nullbasis
+credit     = Ethan Schoonover
+url        = https://ethanschoonover.com/solarized/
+license    = MIT
+licenseurl = https://github.com/altercation/solarized/blob/master/LICENSE
+
+[Palette]
+window          = 238, 232, 213
+windowtext      =   0,  43,  54
+base            = 253, 246, 227
+alternatebase   = 238, 232, 213
+text            =   0,  43,  54
+tooltipbase     = 133, 153,   0
+tooltiptext     =   0,  43,  54
+button          = 238, 232, 213
+buttontext      =   0,  43,  54
+brighttext      =   0,  43,  54
+highlight       =  42, 161, 152
+highlightedtext = 253, 246, 227
+link            =  38, 139, 210
+linkvisited     =  38, 139, 210
+
+[GUI]
+statusnone      =  88, 110, 117
+statussaved     =  42, 161, 152
+statusunsaved   = 203,  75,  22