Add option to specify custom color map

[randomstuff]

This uses a file containing mappings from regexp to colors.

@^io/netty/@ => yellow
@^org/vertx/@ => green
@^sun/@ => blue
@/@ => aqua
/^[A-Za-z_0-9]*$/ => red
/^\[/ => #ff0000
/::/ => red
// => orange

This may be used to highlight different layers/components of an applications, libraries, I/O functions, etc .

[lanseie]

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