weighted wildcards: corrections after automated tests

[Tillerz]

Automated test + code modifications done to ensure all test cases give the proper results:

{} - empty
{red|blonde|black} - no weights
{red:0.1|blonde:0.9} - full weights <= 1
{red:0|blonde|black:0} - disabling 0 weights to force one result
{red:0.5|blonde|black:0.3|brown} - weights <= 1 with distribution of the leftover
{red:1|blonde:2|black:4} - weights > 1 to test normalization
{red:2|blonde|black} - weights > 1, unweighted options should get default of 1
{red:0.5|(blonde:1.3)} - ignore content of ()
{red:0.5|[stuff:1.3]} - ignore content of []
{red:0.5|lora:1.0} - ignore content of <>