integrate rest of @NuPogodi changes #166

- long lines (filenames in 'Document Info') are now splitted in more
  human-readable way (by spaces, dots, slashes or some other characters
- see screenshot)
- the selection of fonts in filemanager (key 'F' or 'Aa') looks now more
  user-friendly
- fixed too long strings in most menues (TOC, Bookmarks, Fonts...) and
  in the popup with the reading progress (called by key 'Menu')
- the position inside the cr-documents (epub, mobi...) now remain nearly
  the same after rescaling the document (i.e. changing the font face,
  size, boldface and interline distance)
- when you open TOC-menu or Fonts Menu, it highlights the current item
  (i.e. current chapter and current fontface).
- i've a bit changed the way to read the battery level values, it might
  now work even without Amazon Kindle framework.

reader.lua

@@ -27,6 +27,7 @@ require "screen"
 require "keys"
 require "commands"
 require "dialog"
+require "extentions"
 
 -- option parsing:
 longopts = {
@@ -40,13 +41,8 @@ longopts = {
 function openFile(filename)
 	local file_type = string.lower(string.match(filename, ".+%.([^.]+)"))
 	local reader = nil
-	if file_type == "djvu" then
-		reader = DJVUReader
-	elseif file_type == "pdf" or file_type == "xps" or file_type == "cbz" then
-		reader = PDFReader
-	elseif file_type == "epub" or file_type == "txt" or file_type == "rtf" or file_type == "htm" or file_type == "html" or file_type == "fb2" or file_type == "chm" or file_type == "mobi" or file_type == "prc" or file_type == "doc" or file_type == "zip" then
-		reader = CREReader
-	end
+
+	reader = ext:getReader(file_type)
 	if reader then
 		InfoMessage:show("Opening document, please wait... ", 0)
 		reader:preLoadSettings(filename)