extsub v0.6

• Fully functioning prototype with Raspberry Pi, LCD display, and Arduino Mega 2650
• Supports multiple SRT files.
• Demo accommodates Arabic, Chinese, English, French, Haitian Creole, Russian, and Spanish. (Subtitles included with the sample are currently just rough online translations intended to show character support only.)
• Stable language switching via button attached to pair of GPIO pins.