todos
[typed arrays] synchronize declaration and definitions of array_buffer_view_new()
[msp430f5529] move exp board definition to a separate file
[msp430f5529] move gpio bindings to exp board file
[msp430f5529] support both uarts on msp430f5529
[msp430f5529] support both UCI0 & UCI1
[msp430f5529] template for msp430f5529 launchpad (MSP-EXP430F5529LP)