Better readme. update changelog

CHANGELOG

@@ -1,6 +1,11 @@
 v1.2.2
+Rebranding to "new session manager"
+Upstream GUI tools "non-session-manager" and "nsm-proxy" converted to standard FLTK instead of a custom toolkit
+New message /nsm/gui/session/root raises NSM_API_VERSION_MINOR from 0 to 1 (1.0 -> 1.1)
 Changed build system to meson
+License upgraded to GPLv3
 Simplified file structure
+Fix compiler warnings.
 
 v1.2.1
-Current state of upstream Non Session Manager including unreleased session_root 
+Current state of upstream Non Session Manager including unreleased /nsm/gui/session/root

README.md

@@ -2,8 +2,11 @@
 
 ## Introduction
 
-New Session Manager (NSM) is a computer program to help handling other music production programs.
-It is intended for Linux and other Free and Open Source operating systems.
+New Session Manager (NSM) is a tool to assist music production by grouping standalone programs into sessions.
+Your workflow becomes easy to manage, robust and fast by leveraging the full potential of cooperative applications.
+
+It is a community version of the "NON Session Manager" and free in every sense of the word:
+free of cost, free to share and use, free of spyware or ads, free-and-open-source.
 
 You can create a session, or project, add programs to it and then use commands to save, start/stop,
 hide/show all programs at once, or individually. At a later date you can then re-open the session