windows: Add @yincrash's windows install package

[DeeDeeG]

Adds an install process to replace Emoji on Windows.
It merges the Twemoji font with Segoe UI Symbol on the user's machine,
and replaces Segoe UI Emoji as well on Win 8 and 10.

An uninstall script is also included to assist the user in restoring
the original Windows fonts.

README also updated.

Fixes #9

[DeeDeeG]

I would like to mention some minor changes that were made in the files, beyond replacing the text "emojione" with "twemoji" or "Twitter Color Emoji." Some of these changes are not reflected in diffs, since they occur in sections of files that are completely new to this repository.

Changes are:

• Version numbers in the project (i.e. in README.md and Makefile) are changed from 1.1 -> 1.2, anticipating a new release after this pull request would be accepted.

• Also included a bump to the Python version number mentioned in the instructions, 3.5 -> 3.6, line 173 of README.md , as users following the instructions will end up downloading this version.

• Fixed a minor typo in a URL at line 175 of the new README.md, effectively "TwitterColorEmoji-SVGinOT-1.2-Win.zip" -> "TwitterColorEmoji-SVGinOT-Win-1.2.zip"

• Fixed a potential grammar error in a comment located at lines 89 and 95 in the new install.cmd:
  "It is not overwritten" (used to be displayed in every case) -> "It is not overwritten" (now displayed when referring to just one font) "They are not overwritten" (now displayed when referring to both fonts).

[DeeDeeG]

I just noticed line 160 of the new README.md is wrong. It reads "https://github.com/eosrei/emojione-color-font/releases/download/v1.3/EmojiOneColor-SVGinOT-1.3.zip"

but it should read "https://github.com/eosrei/twemoji-color-font/releases/download/v1.2/TwitterColorEmoji-SVGinOT-1.2.zip"

[DeeDeeG]

I fixed a couple issues with this pull request, and re-submitted here: #13

[13rac1]

No need to close PRs. Amend your commits and force push the changes to your branch/fork. ;)

git add changed-file
git commit --amend
git push -f