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/ht9170/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (libname "ht9170")
-set (libdescription "Ht9170 DTMF decoder")
+set (libdescription "Dual Tone Multi Frequency (DTMF) Decoder")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
 upm_module_init(mraa)

src/ht9170/ht9170.hpp

@@ -37,7 +37,7 @@ namespace upm {
   /**
    * @library ht9170
    * @sensor ht9170
-   * @comname HT9170 DTMF Decoder
+   * @comname Dual Tone Multi Frequency (DTMF) Decoder
    * @altname HT9170B, HT9170D
    * @type other
    * @man seeed