make filters configurable

[dkd-kaehm]

as an integrator i want to declare each column in Form log module (module.tx_formlog.settings.list.columns) as filter.

Currently its only possible to filter by Page-Title and Date.
Moreover Page-Title filter can grap wrong entries if some Page with same Title exists.
This makes cleaning of CSV export impossible. For Example we could disable some CSV columns by TypoScript condition by using the filter(PID of the Form):

[globalVar = GPmerged:tx_formlog_web_formloglist|filters|pid|value| = {$global.myForm.pageuid}]
  module.tx_formlog.settings.list.columns.export.columns >
  // declare clean list of fields to export
[global] 

and the setting could look like this:

module.tx_formlog.settings {
   list {
     columns {
       1000 {
         property = pid
         label = PageUid
         filterable = 1
       }
     }
   }