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/ecezo/CMakeLists.txt

@@ -1,5 +1,5 @@
 upm_mixed_module_init (NAME ecezo
-    DESCRIPTION "EC EZO Atlas Scientific EC circuit"
+    DESCRIPTION "Electrical Conductivity (EC) Circuit"
     C_HDR ecezo.h ecezo_defs.h
     C_SRC ecezo.c
     CPP_HDR ecezo.hpp

src/ecezo/ecezo.hpp

@@ -41,7 +41,7 @@ namespace upm {
     /**
      * @library ecezo
      * @sensor ecezo
-     * @comname EC-EZO EC Sensor
+     * @comname Electrical Conductivity (EC) Circuit
      * @type liquid
      * @man sparkfun
      * @con uart i2c