releasenotes.txt: new notes for 2.20 (#8052)

Author: danmar

releasenotes.txt

@@ -1,48 +1,20 @@
-Release Notes for Cppcheck 2.19
+
+Release Notes for Cppcheck 2.20
 
 Major bug fixes & crashes:
-- Crash in CheckClass::checkConst()
-- fuzzing crash (assert) in Token::update_property_info()
-- Crash in checkConstVariable()
-- Crash in valueFlowLifetimeClassConstructor()
-- GUI: scratch pad crash
-- Assert failure in getParentValueTypes()
-- Crash in simplecpp::Macro::expand()
-- crash in Tokenizer::simplifyCPPAttribute()
+-
 
 New checks:
-- Detect zero initialization of unions in which its largest member is not
-  declared as the first one. Depending on the compiler, there's no guarantee
-  that the complete union will be zero initialized in such scenarios leading to
-  potential access of uninitialized memory.
-- Added warning when main() throws an exception
+-
 
 C/C++ support:
-- Fixed syntax error for C++23 lambda without parameter clause
-- Added support for typeof and __typeof operators
+-
 
 GUI:
-- Fix bug: checks multiple configurations even though user provides defines
+-
 
 Changed interface:
-- some `preprocessorErrorDirective` and `syntaxError` errors got more specific error IDs.
-- Removed deprecated platforms unix32-unsigned and unix64-unsigned
-- Improve progress value
-- Added float bits support in platform configuration
-- Fixed --showtime not accounting for addons
-
-Performance:
-- Introduced cache for followAllReferences() calls
+-
 
 Infrastructure & dependencies:
-- Removed deprecated support for builds with Qt5.
-- Added make variables `CXXOPTS` and `LDOPTS` to extend existing `CXXFLAGS` and `LDFLAGS`.
-- Added make variables `CPPOPTS` to extend existing `CPPFLAGS`.
-- `CPPFLAGS` are not longer being passed to the linker command for `cppcheck` and `testrunner`.
-- Updated Qt to 6.10.0 (official Windows release only).
-- The official Windows binary is now built against Boost 1.89 for increased performance.
-- Updated to simplecpp 1.6.2
-- The Visual Studio builds not longer set the `WIN32` define.
-- Added `DISALLOW_PROCESS_EXECUTOR` for building without fork().
-
-The changes focus heavily on stability (crash fixes), C/C++ compatibility, reducing false positives, and improving performance.
+-