Refactor to move PerlValue to its own js file
Improve rendering of PerlValues in the watch window

It now shows the ref type, blessed package and refaddr for references

It shows the array length and number of hash keys
use Bootstrap badges for hash/array sizes instead of text
refactor rendering PerlValues

Each type of Perl value now has a subclass that renders itself
Fix rendering of GLOB types

Got the dt and dd backwards