Use hyphens in cmake instead of underscores when appropriate

We prefer hyphens ("-") over underscores inside file names. This should be applied to CMakeLists.txt as well.

Closes #3 (closed).

CMakeLists.txt

 cmake_minimum_required(VERSION 3.14)
 project(exple_cmake_build CXX)
 
-option(DOWNLOAD_DEPS "Enable automatic download of dependencies" ON)
+option(DOWNLOAD_DEPS ON)
 
-# download dependency 'explelibx_common' or find it locally
+# download dependency 'explelibx-common' or find it locally
 if (DOWNLOAD_DEPS)
   include(FetchContent)
   FetchContent_Declare(
-    explelibx_common
+    explelibx-common
     GIT_REPOSITORY http://tesla.parallel.ru/vonopr/explelibx-common.git
     GIT_TAG e45b60782a6414125c7300d9b7a77d34a8404d6e)
-  FetchContent_MakeAvailable(explelibx_common)
-  set(COMMON_DIR "${explelibx_common_SOURCE_DIR}")
+  FetchContent_MakeAvailable(explelibx-common)
+  set(COMMON_DIR "${explelibx-common_SOURCE_DIR}")
 else()
   if (NOT DEFINED COMMON_DIR)
     file(REAL_PATH "${PROJECT_SOURCE_DIR}/../../explelibx-common" COMMON_DIR)
@@ -24,15 +24,15 @@ else()
   message("    COMMON_DIR: ${COMMON_DIR}")
 endif()
 
-# download dependency 'explelibx_mgrid' or find it locally
+# download dependency 'explelibx-mgrid' or find it locally
 if (DOWNLOAD_DEPS)
   include(FetchContent)
   FetchContent_Declare(
-    explelibx_mgrid
+    explelibx-mgrid
     GIT_REPOSITORY http://tesla.parallel.ru/vonopr/explelibx-mgrid.git
     GIT_TAG c345859b9ebca2227e3b3faea4cc2380fdbb054f)
-  FetchContent_MakeAvailable(explelibx_mgrid)
-  set(GRID_DIR "${explelibx_mgrid_SOURCE_DIR}")
+  FetchContent_MakeAvailable(explelibx-mgrid)
+  set(GRID_DIR "${explelibx-mgrid_SOURCE_DIR}")
 else()
   if (NOT DEFINED GRID_DIR)
     file(REAL_PATH "${PROJECT_SOURCE_DIR}/../../explelibx-mgrid" GRID_DIR)
@@ -70,7 +70,7 @@ list(TRANSFORM CURRENT_SOURCES PREPEND "${SOURCE_DIR}/")
 list(TRANSFORM CURRENT_HEADERS PREPEND "${HEADER_DIR}/")
 
 # set targets
-add_executable(exple_add_numbers
+add_executable(exple-add-numbers
   "${CURRENT_SOURCES}" 
   "${CURRENT_HEADERS}"
   "${COMMON_SOURCES}" 
@@ -78,9 +78,7 @@ add_executable(exple_add_numbers
   "${GRID_SOURCES}"
   "${GRID_HEADERS}")  # headers should be explicitly added to the target to be shown in IDEs after mentioned in source_group()
                      # if using Visual Studio switch to project's target representation
-set_property(TARGET exple_add_numbers PROPERTY OUTPUT_NAME  "exple-add-numbers")
-
-target_include_directories(exple_add_numbers PRIVATE
+target_include_directories(exple-add-numbers PRIVATE
   "${HEADER_DIR}"
   "${COMMON_HEADER_DIR}"
   "${GRID_HEADER_DIR}")