Currently tinydtls uses EPL-1.0 and mixing with EPl-2.0 is not
recommended. Therefore adjust the EPL-2.0 of new files to
EPL-1.0.
Signed-off-by: Achim Kraus <achim.kraus@cloudcoap.net>
Add also license headers and apply minor fixes.
Append version to shared library on install.
Amend README.md with instructions to use cmake.
Signed-off-by: Achim Kraus <achim.kraus@bosch.io>