support date_custom_func exFilterColumn, clear

[louking]

This should fix the following issues.

• https://github.com/vedmack/yadcf/issues/644
• https://github.com/vedmack/yadcf/issues/645

Note for #644, I considered moving the filter clear $('#yadcf-filter-' + table_selector_jq_friendly + '-' + column_number).val('').removeClass("inuse"); above the modified if/else clause, but was worried about unintended side-effects.

Working example: https://jsbin.com/tanogon/edit?html,js,output

[vedmack]

looks good! thank m8

[louking]

note I didn't update the header of the js file with the new release number as I was confused about the release numbering. i.e., would this be beta 46 or beta 1 of the next version? I also didn't mark the issues as fixed