add input methdod framework (add sitelen pona input)

Also change audio player randomness source to /dev/urandom which is way better for the prng we are using

docs/system/input_methods.md

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+Use the shortcut Alt+<Space> to switch between the input methods.
+
+## Current Input Methods
+
+### LAT
+
+Directly passes all keyboard inputs without any extra processing.
+
+### TOK: Toki Pona
+
+Intercepts all latin letters used in Toki Pona, stores it in buffer. Press enter to turn buffer into Sitelen Pona characters. Press delete to clear buffer.
+
+󱤿󱥁󱤧󱤆󱤉󱥂󱥍󱥬Lasina󱥩󱥠󱥔
+󱤑󱤧󱥠󱤉󱥂󱥍󱥬Lasina󱤡󱤿󱥁󱤧󱥌󱤉󱥂󱥩󱥓
+󱤑󱤧󱥠󱤉󱥂Enter󱤡󱥂󱥍󱤏󱥓󱤧󱤖󱥠󱥔