Update Syn to 0.15.0

[zrpnr]

The Syn library has been under active development, and the current release is 0.15.0. MinkSelenium2Driver uses 0.0.3 currently.
In 0.15.0 there was a fix for the deprecated which property.
bitovi/syn#180

This affects any sites that are running tests with keyPress events if, for example- they use the latest jQuery 3.6.0 that removed a shim for this property.
jquery/jquery#4765

There was discussion about updating Syn in:

• Queries re use of Syn library #279
• Drag and Drop not generating HTML5 "drop" event #20

The minified js in this PR comes from the v0.15.0 tag of https://github.com/bitovi/syn
I added

options: {
  minify: true
},

to the export command in build.js and ran npm run build to produce dist/global/syn.js

In Selenium2Driver.php updated Syn to syn and updated the trigger function since the order of arguments has changed.

[aik099]

@zrpnr , please make sure tests are passing. Right now they're not.

[mvorisek]

@aik099 #358 was merged, let's close this PR

[aik099]

Closing in favor of #358 .