MLECO-3183: Refactoring application sources

Platform agnostic application sources are moved into application
api module with their own independent CMake projects.

Changes for MLECO-3080 also included - they create CMake projects
individial API's (again, platform agnostic) that dependent on the
common logic. The API for KWS_API "joint" API has been removed and
now the use case relies on individual KWS, and ASR API libraries.

Change-Id: I1f7748dc767abb3904634a04e0991b74ac7b756d
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>
diff --git a/source/application/api/common/CMakeLists.txt b/source/application/api/common/CMakeLists.txt
new file mode 100644
index 0000000..5078adc
--- /dev/null
+++ b/source/application/api/common/CMakeLists.txt
@@ -0,0 +1,59 @@
+#----------------------------------------------------------------------------
+#  Copyright (c) 2022 Arm Limited. All rights reserved.
+#  SPDX-License-Identifier: Apache-2.0
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#----------------------------------------------------------------------------
+
+#########################################################
+#  Common utility library used by use case libraries.   #
+#  NOTE: this library should not depend on HAL.         #
+#########################################################
+
+cmake_minimum_required(VERSION 3.15.6)
+
+set(COMMON_UC_UTILS_TARGET common_api)
+project(${COMMON_UC_UTILS_TARGET}
+    DESCRIPTION     "Common Utilities library"
+    LANGUAGES       CXX)
+
+# Create static library
+add_library(${COMMON_UC_UTILS_TARGET} STATIC)
+
+## Include directories - public
+target_include_directories(${COMMON_UC_UTILS_TARGET}
+    PUBLIC
+    include
+    ${TENSORFLOW_SRC_PATH}/tensorflow/lite/micro/tools/make/downloads/flatbuffers/include)
+
+## Sources
+target_sources(${COMMON_UC_UTILS_TARGET}
+    PRIVATE
+    source/Classifier.cc
+    source/ImageUtils.cc
+    source/Mfcc.cc
+    source/Model.cc
+    source/TensorFlowLiteMicro.cc)
+
+# Link time library targets:
+target_link_libraries(${COMMON_UC_UTILS_TARGET}
+    PUBLIC
+    log                     # Logging functions
+    arm_math                # Math functions
+    tensorflow-lite-micro)  # TensorFlow Lite Micro library
+
+# Display status:
+message(STATUS "*******************************************************")
+message(STATUS "Library                                : " ${COMMON_UC_UTILS_TARGET})
+message(STATUS "CMAKE_SYSTEM_PROCESSOR                 : " ${CMAKE_SYSTEM_PROCESSOR})
+message(STATUS "*******************************************************")