Seamless clipboard, support of RDS API, drain of disconnected sessions, reduced memory usage, improved display tweaking on high latency, etc.

(extracted from changelog)

2019-11-19 Version 2.7.0 (stable)
* HOTFIX * fixed a critical issue with FreeRDP (exit code 131085) when using an RD license server configured in "per device" mode, past the 120 days of the RDS grace period
updated readme and documentation about the RDS role
the browser "heartbeat" (used to detect if the browser window/tab was closed) is now on a different timer than the periodical fullscreen update (config.js; default 10 secs)
disabled the alt key capture because it may interfere with the browser alt+key menu
keys following the alt+gr modifier are now sent as scancode instead of unicode
ability to configure the login url (by default the myrtille login page; web.config)
updated the installer for a better display of prerequisites
added the option into the installer to choose either to pass the http session ID into url or store it into the default "ASP.NET_SessionId" cookie (the former allows multiple connections/tabs or iframes)
the connection API is now out of beta and installed by default (full auto-connect/start program from url syntax is still available)
the scale feature now keeps the aspect ratio on browser resize
fixed a display refresh issue under chrome + https if the clipboard is empty
increased the image cache duration (1 sec -> 3 secs)
halved the input buffer duration (based on the roundtrip duration)
updated display tweaking
improved cleanup on session disconnect into wfreerdp to prevent memory leaks with GDI+
improved cleanup on session disconnect into Myrtille to prevent memory leaks on the application pool
removed any unnecessary memory allocation and released any disposable object on the application pool
the application pool is now automatically recycled when there is no active remote session (configurable into web.config)
fixed an issue related to the disconnect callback (which was sometimes not received by the gateway due a WCF deadlock)
scripts and styles now have computed hashes to prevent browser caching (in case content is changed); they could also be minified, as needed (see comments in BundleConfig.cs)
re-enabled multiple connections/tabs (web.config, read comments about security)
the address of the connected server is now displayed into the window/tab title, if not using a connection API (thanks Zak)
fixed invalid mouse cursor update under certain circumstances (thanks joburg)
fixed potential delayed wfreerdp exit in case of session disconnect

2019-09-02 Version 2.6.0 (not released-beta)
resynced FreeRDP (2.0.0-dev5)
added a REST API to disconnect a given remote session or all of them (on a gateway)
fixed an issue with some network or domain configuration that could delay the start of a connection
support of Connection Broker database, in High Availability mode
support of RDS API
configurable drain of disconnected sessions
seamless clipboard synchronization, using the async clipboard API (requires Chrome and HTTPS) with fallback to standard web API (for other browsers and HTTP)
now hiding iframe content on browser resize
various mockup improvements
get focus back on main window after a popup is closed
screenshot is now returned as HttpResponseMessage, byte array content
clipboard virtual channel comments and check
the self-signed certificate (installed by myrtille on install) is now issued with the machine FQDN to prevent ERR_CERT_AUTHORITY_INVALID (Subject Alternative Name Missing) in recent Chrome releases
now using a web worker for the periodical fullscreen updates to keep them going even if the main thread is paused (due to inactive window/tab, after focus lost for example)
some refactoring