RFR: 8347362: RichTextArea Demo Apps Build Script [v2]

[Andy Goryachev]

> Added ant build to the RichTextAreaDemo project.
> 
> ## Building
> 
> Build: run `ant` command in the project directory.
> 
> ## Running Demos
> 
> Use the following commands to run demos build in the previous section:
> 
> Code Area Demo: `ant run-codearea-demo`
> 
> Notebook Demo: `ant run-notebook-demo`
> 
> Rich Editor Demo: `ant run-richeditor-demo`
> 
> RichTextArea Tester: `ant run-richtextarea-demo`

Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:

  no spawn

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1672/files
  - new: https://git.openjdk.org/jfx/pull/1672/files/02e70f87..717e2c10

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1672&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1672&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx/pull/1672.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1672/head:pull/1672

PR: https://git.openjdk.org/jfx/pull/1672