doc: Scrubbed ALL sensor library descriptions

In an effort to clean-up and standardize UPM library
documentation, this commit updates (and in most cases,
unifies) the CMake description string AND CXX header
@comname string.

Strings were taken from datasheets when possible, spelling
mistakes were addressed, copy/paste errors where fixed,
Title Case was used, etc.

    * Tested/updated/added @web tags
    * Added/updated invalid sensor images
    * Added/updated @man tags, added missing manufacturers

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/mma7361/CMakeLists.txt

@@ -1,5 +1,5 @@
 upm_mixed_module_init (NAME mma7361
-    DESCRIPTION "Triaxial analog accelerometer"
+    DESCRIPTION "Triaxial Analog Accelerometer"
     C_HDR mma7361.h
     C_SRC mma7361.c
     CPP_HDR mma7361.hpp

src/mma7361/mma7361.hpp

@@ -42,7 +42,7 @@ namespace upm {
   /**
    * @library mma7361
    * @sensor mma7361
-   * @comname DFRobot MMA7361 Analog Accelerometer
+   * @comname Triaxial Analog Accelerometer
    * @type accelerometer
    * @man dfrobot
    * @con ainput gpio