1.4.0 draft

Author: avarga

WHATSNEW.md

@@ -1,5 +1,28 @@
 # What's New in Simu5G
 
+## v1.4.0 (2025-09-04)
+
+Naming convention:
+
+- Sources are now under `src/simu5g/` instead of just `src/`, so that header includes
+  start with `simu5g/...`
+- Renamed several directories to bring directory names closer to the all-lowercase convention. E.g.
+  `mec/UALCMP/` became `mec/ualcmp/`, and `mec/MECPlatform` became just `mec/platform`.
+- Moved folders, e.g. nodes/mec/ promoted to mec/ (moved one level up)
+- Renamed several classes to ensure that only the first letter of acronyms is uppercase. E.g. MECHost became MecHost
+- Renamed several parameters, e.g. bs_noise_figure became bsNoiseFigure, and fading_paths became
+  numFadingPaths
+- `PdcpRrc` became just `Pdcp`, and `pdcpRrc` submodules became `pdcp`
+
+Other changes:
+- Moved fields added in C++ into .msg files. Goal: make packets more inspectable, and packet contents
+to be written into parsimPack (useful for deeper regression testing via fingerprints)
+- MacCid: turn in into a real class with separate fields for the node ID and LCID
+- carrierFrequency: change double to GHz in the code
+- Binder: added several WATCHes; some refactoring of its internals and stylistic changes on its API
+- Pdcp modules: remove unused EUTRAN_RRC_Sap port and associated handling code
+
+
 ## v1.3.1 (2025-09-04)
 
 Changes: