refactor(core): Bump version to 1.4.0-rc1 #1079

Job	Run time
Debug Build & Unit Tests (gcc)	1m 24s
Debug Build & Unit Tests (gcc, 32bit)	1m 42s
Debug Build & Unit Tests without Subscriptions (gcc)	1m 29s
Debug Build & Unit Tests with Diagnostics (gcc)	49s
Debug Build & Unit Tests with multithreading (gcc)	1m 56s
Debug Build & Unit Tests with Alarms&Conditions (gcc)	1m 11s
Debug Build & Unit Tests (clang)	1m 11s
Debug Build & Unit Tests (tcc)	1m 22s
Encryption (MbedTLS) Build & Unit Tests (gcc)	2m 48s
PubSub Encryption (MbedTLS) Build & Unit Tests (gcc)	3m 36s
PubSub SKS Build & Unit Tests (gcc)	3m 24s
Encryption (OpenSSL) Build & Unit Tests (gcc)	2m 27s
Encryption (LibreSSL) Build & Unit Tests (gcc)	4m 51s
TPM Tool Build	2m 18s
Release Build	1m 7s
Amalgamation Build	56s
Amalgamation Build with Multithreading	1m 15s
Valgrind Build & Unit Tests with MbedTLS (gcc)	1m 18s
Valgrind Build & Unit Tests with OpenSSL (gcc)	41s
Valgrind Examples with MbedTLS (gcc)	40s
Valgrind Examples with OpenSSL (gcc)	1m 18s
Clang Static Analyzer	55s
Build All Companion Specifications	9m 9s
	47m 47s

Provide feedback