TOC generation does not work properly when document headers have parens

[fmenozzi]

Description

When calling :WikiTocGenerate on a document whose header has parens, the parens are not URL-encoded and thus conflict with the markdown link syntax []().

Minimal working example

Suppose you have a document like so:

# Title (with parens)

## Heading

## Another Heading

Calling :WikiTocGenerate will produce the following TOC:

Contents:
* [Title (with parens)](#Title (with parens))
    * [Heading](#Title (with parens)#Heading)
    * [Another Heading](#Title (with parens)#Another Heading)

# Title (with parens)

## Heading

## Another Heading

These links produced in the TOC will not work when using Enter to try and follow them.

I believe the solution would simply be to URL-encode ( and ) in header names when generating the TOC.