Update swanalekha input method
The input method was updated to support recently added unicode points. Notable changes are
- Atomic chillus are produced now
- Vowel signs can be typed by prefixing @. @u = ു
- Malayalam numerals can be produced by @1, @2 etc
- There is a bug for ഥ - It should get produced by Tha as well
- Support for inputting ഩ, ഺ, ൿ, ൔ, ൕ, ൖ
Detailed key mapping is available in this table: http://swanalekha.smc.org.in/swanalekha.pdf