Multiple changes/adaptions

[echalone]

• Sections, like for example Description, without data (and without example data due to new switch -SkipEmptyFields) will no longer be rendered
• Added switch -SinglePage to cmdlet New-MarkdownHelp so all functions will be written into the same module markdown file (same name as module landing page would normally have), instead of writing every cmdlet into its own markdown file
• Added switch -NoInputOutputFormatting to cmdlets New-MarkdownHelp, Update-MarkdownHelp and Merge-MarkdownHelp so Input/Output comments won't be formatted. This is because microsoft gives us no way to actually set the values in Input/Output correct (type, description) in a PS function header, but will put everything written there into the "type" property, so all text will be formatted bold. So for this to work correctly (not as intended) this switch needs to be provided so everything in the Input/Output section will just be written as is, without any bold formatting.
• Added switch -SkipEmptyFields to cmdlets New-MarkdownHelp, Update-MarkdownHelp and Update-MarkdownHelpModule which will omit example text for empty fields which were not provided/found and will instead just skip empty sections
• Added switch -CreateTableOfContent to cmdlet New-MarkdownHelp which will create an additional table of content in the single- or module-landing-page.
• Added switch -WithModuleMetaData to cmdlet New-MarkdownHelp which will add a section "Module Metadata" filled with the following data (as far as that data exists): Module version, Author, Company, Copyright, Tags, License Uri, Project Uri
• Added module version to yaml metadata at beginning of markdown
• Fixed rendering of example Introduction (is array but wasn't handled as array) and removed "PS>", "PS >" (PS Core default) and "PS C:>" (PS 5 default) from Introduction array (apparently microsoft is putting everything before a > sign in an example into introduction, even its default values, so we had to delete those default values from the array for the documentation to be generated as was previously, so without a "PS >" or "PS C:>" being suddenly in the introduction of every example).
• Adapted UnitTests to work with removed empty sections (due to missing data)

[echalone]

Okay, seems one UnitTest is failing, I might have to take another look at that tomorrow

[echalone]

Alright, seems everything is fixed now :)

[echalone]

Fixed a bug with new Switch -WithModuleMetaData and added help text for all the new switches in the documentation

[echalone]

Fixed metadata output bugs (on github everything appeared as one line in the metadata, some more linebreaks were needed for the headers as well)