[Petal] [PATCH] Change to XML encode and decode

[Fergal Daly]

The XML encode and decode routines do 4 regex substitiutions each, one for 
each thing that need to be (un)escaped. This patch turns it into a single 
regex, using a hash lookup on the right hand side.

The hash lookup is going to slow things down slightly whenever something is 
substituted but the fact that there's only 1 regex instead of 4 should give a 
good speed boost, especially if the string is long.

No tests fail,

Fergal
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