draft PR: search functionality in custom shortcuts panel

[palashb01]

Fixes #48

Changes:

• a search bar in the custom shortcut panel.

Demo Video:

Problem:

• Currently to check whether the given custom input is assigned to something is a procedure where, inside customShortcuts.vue a function
  warnOverride($('#pressedKeys').text(), targetPref.value) is called where targetPref send something like this:

• after this inside actions.js file a function is called ref, which iterate through all the present children of div and match whether it has been assigned already or not.

• with the new changes if you search something then the number of shortcuts will reduce on the screen which reduces the child div;s because of this:

• if you try to assign a shortcut that has already been assigned to something else( which is not shown on the screen) then it won't warn and just assign that shortcut to the given command.

I was wondering if there could be a way to implement this feature of checking the assigned shortcuts differently instead of children div's then this search functionality could work much better.

cc: @devartstar @tachyons

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palashb01

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