Update dependencies and normalize namespace

[JimBobSquarePants]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

• Updates Fonts
• Update ImageSharp
• Normalize namespace to use SixLabors.ImageSharp as the base throughout.

[codecov]

Codecov Report

Merging #25 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master      #25   +/-   ##
=======================================
  Coverage   68.47%   68.47%           
=======================================
  Files          66       66           
  Lines        4951     4951           
=======================================
  Hits         3390     3390           
  Misses       1561     1561

Flag	Coverage Δ
#unittests	68.47% <0%> (ø)	⬆️

Impacted Files	Coverage Δ
src/ImageSharp.Drawing/Processing/SolidBrush.cs	95% <ø> (ø)	⬆️
...ageSharp.Drawing/Processing/RadialGradientBrush.cs	100% <ø> (ø)	⬆️
...rc/ImageSharp.Drawing/Processing/DrawingHelpers.cs	100% <ø> (ø)	⬆️
src/ImageSharp.Drawing/Shapes/Path.cs	71.79% <ø> (ø)	⬆️
...cessing/Extensions/FillPathCollectionExtensions.cs	100% <ø> (ø)	⬆️
src/ImageSharp.Drawing/Shapes/EllipsePolygon.cs	84.05% <ø> (ø)	⬆️
...arp.Drawing/Shapes/PolygonClipper/ClippablePath.cs	0% <ø> (ø)	⬆️
...rawing/Processing/Extensions/DrawPathExtensions.cs	66.66% <ø> (ø)	⬆️
...ageSharp.Drawing/Shapes/Helpers/ArrayExtensions.cs	87.5% <ø> (ø)	⬆️
...rawing/Processing/Extensions/DrawTextExtensions.cs	100% <ø> (ø)	⬆️
... and 48 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5bc978b...88a73c3. Read the comment docs.

[tocsoft]

looks fine just the small issue of duplicate InternalsVisibleTo