Adding Open-Dyslexic font files (.otf) to assets.
Reading font files from assets and merging.

1. Renamed fileList to externalFontFiles to receive an Array of Files
pointing to font files in SDcard.
2. Created a List of Files (ZLFile) pointing to files in assets/fonts
3. Filtered font files and converted the List to an Array.
4. Merged two Arrays into fileList
Modifying detectInfo(File file) to create InputStreams to assets
Allowing to create Typeface from assets

1. Created a method to get AssetManager
2. Explicitly created Typeface if File points to assests
(createFromFile() cannot be used for assests)

Arrays.copyOf() cannot be used for API 8. Explicitly copied the Array.