Feature Request: Add GetText method to PdfPage (#15)

Upgrade to latest PdfiumCore.

Updates for new packages.

Updated versions for new release.

Consolidated the versions.
Upgraded packages.

Updated for new core libraries.

Update for additional editor configs.

Removed unused usings.

Removed unneeded Repeat test attribute.
Simplified rendering methods.

Updated for SourceLink.

Extracted Dispatcher into DtronixCommon project.

Updated all Dispatcher references to the new methods.

Updated readme with info of project.

Closes #4.
Set version to 1.0.