switch to suffix forms of mach literals

[graydon]

u32(1234) should be 1234u32, and handled in the lexer The former is chatty and confuses the issue with runtime calls / casts (the latter of which should be shifted to 'as' casts anyway).

[graydon]

Switch machine-type lexemes to use suffixes. Remove support for foo(bar) as a cast notation. Closed by 8030757.