Change OAI license to CSSL v1.0 (and others)

- all RAN code, CI code, configuration files, dockerfiles, in CSSL v1.0
- all deployment code (openshift, charts, ancillary files like shell
  scripts), in MIT
- documentation in CC-BY-4.0
- exceptions might apply and are listed in NOTICE
- there is a new LICENSES folder with all licenses
- CONTRIBUTIONS.md has been updated accordingly

For automated changes based on OAI PL v1.1:

    perl -i~ -0pe 's/\/\*.*Licensed to the OpenAirInterface.*openairinterface.org\n#?/\/*\n * SPDX-License-Identifier: LicenseRef-CSSL-1.0\n/s' **/*.{c,h,cpp}
    perl -i~ -0pe 's/\/\*.*Licensed to the OpenAirInterface.*openairinterface.org\n#?/\/*\n * SPDX-License-Identifier: LicenseRef-CSSL-1.0\n/s' **/*.ts
    perl -i~ -0pe 's/<!--.*Licensed to the OpenAirInterface.*openairinterface.org\n.*-->/<!-- SPDX-License-Identifier: LicenseRef-CSSL-1.0 -->/s' **/*.xml

The rest (cmake, files with missing license, cmake) manually.

common/utils/T/DOC/T.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 # T tracer
 
 The T tracer is sort of a *framework* to debug and monitor the softmodem.

common/utils/T/DOC/T/basic.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 # Basic usage of the T
 
 ## Compilation

common/utils/T/DOC/T/csv.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 # csv
 
 This tracer is used to dump information of a single trace to a CSV.

common/utils/T/DOC/T/enb.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 
 ![enb_trace](./enb_trace.png)
 [source file of this image](./enb_trace.odp)

common/utils/T/DOC/T/howto_new_trace.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 # T tracer - a simple tutorial
 
 There is a diff file with all modifications:

common/utils/T/DOC/T/multi.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 # Multiple tracers
 
 To connect several tracers to the same process, first launch the `multi`

common/utils/T/DOC/T/record.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 # Record
 
 First, read the [basic usage](./basic.md) to compile things.

common/utils/T/DOC/T/replay.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 # Replay
 
 First, read the [basic usage](./basic.md) to compile things.

common/utils/T/DOC/T/to_vcd.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 # to_vcd
 
 This tracer is used to dump a VCD trace of the softmodem.

common/utils/T/DOC/T/wireshark.md

@@ -1,3 +1,5 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
 # MAC PDUs and wireshark
 
 First, read the [basic usage](./basic.md) to compile things.