refactor(server): Store Subscription late-ness in dedicated Boolean flag #1033

Job	Run time
Debug Build & Unit Tests (gcc)	3m 34s
Debug Build & Unit Tests (gcc, 32bit)	4m 13s
Debug Build & Unit Tests without Subscriptions (gcc)	1m 57s
Debug Build & Unit Tests with Diagnostics (gcc)	3m 41s
Debug Build & Unit Tests with multithreading (gcc)	2m 32s
Debug Build & Unit Tests with Alarms&Conditions (gcc)	12m 29s
Debug Build & Unit Tests (clang)	5m 54s
Debug Build & Unit Tests (tcc)	2m 51s
Encryption (MbedTLS) Build & Unit Tests (gcc)	2m 44s
PubSub Encryption (MbedTLS) Build & Unit Tests (gcc)	3m 20s
PubSub SKS Build & Unit Tests (gcc)	4m 17s
Encryption (OpenSSL) Build & Unit Tests (gcc)	2m 46s
Encryption (LibreSSL) Build & Unit Tests (gcc)	7m 23s
TPM Tool Build	3m 16s
Release Build	1m 32s
Amalgamation Build	1m 7s
Amalgamation Build with Multithreading	1m 4s
Valgrind Build & Unit Tests with MbedTLS (gcc)	17m 19s
Valgrind Build & Unit Tests with OpenSSL (gcc)	17m 43s
Valgrind Examples with MbedTLS (gcc)	1h 9m 58s
Valgrind Examples with OpenSSL (gcc)	1h 9m 39s
Clang Static Analyzer	4m 35s
Build All Companion Specifications	18m 2s
	4h 21m 56s

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