Fix build errors in linux

[lcinacio]

Added bufferutil & utf-8-validate to package.json. Fixed different case between import statement & file system to prevent build error in linux

[MickWang]

I changed filenames all to start with lower case, but git ignores some files. Then i use 'git config core.ignorecase false' to let git detect the filename change. I will push a commit to solve this problem.
Could you tell me about why you need to add bufferutil & utf-8-validate？

[lcinacio]

Without adding bufferutil & utf-8-validate to package.json I get the warnings below:
WARNING in ./node_modules/ws/lib/buffer-util.js
Module not found: Error: Can't resolve 'bufferutil' in 'C:\Users\luizi\ontology-ts-sdk\node_modules\ws\lib'
resolve 'bufferutil' in 'C:\Users\luizi\ontology-ts-sdk\node_modules\ws\lib'
Parsed request is a module
using description file: C:\Users\luizi\ontology-ts-sdk\node_modules\ws\package.json (relative path: ./lib)
after using description file: C:\Users\luizi\ontology-ts-sdk\node_modules\ws\package.json (relative path: ./lib)
resolve as module
C:\Users\luizi\ontology-ts-sdk\node_modules\ws\lib\node_modules doesn't exist or is not a directory
C:\Users\luizi\ontology-ts-sdk\node_modules\ws\node_modules doesn't exist or is not a directory
C:\Users\luizi\ontology-ts-sdk\node_modules\node_modules doesn't exist or is not a directory
C:\Users\luizi\node_modules doesn't exist or is not a directory
C:\Users\node_modules doesn't exist or is not a directory
C:\node_modules doesn't exist or is not a directory
looking for modules in C:\Users\luizi\ontology-ts-sdk\node_modules
using description file: C:\Users\luizi\ontology-ts-sdk\package.json (relative path: ./node_modules)
after using description file: C:\Users\luizi\ontology-ts-sdk\package.json (relative path: ./node_modules)
using description file: C:\Users\luizi\ontology-ts-sdk\package.json (relative path: ./node_modules/bufferutil)
no extension
C:\Users\luizi\ontology-ts-sdk\node_modules\bufferutil doesn't exist
.ts
C:\Users\luizi\ontology-ts-sdk\node_modules\bufferutil.ts doesn't exist
.js
C:\Users\luizi\ontology-ts-sdk\node_modules\bufferutil.js doesn't exist
as directory
C:\Users\luizi\ontology-ts-sdk\node_modules\bufferutil doesn't exist

WARNING in ./node_modules/ws/lib/validation.js
Module not found: Error: Can't resolve 'utf-8-validate' in 'C:\Users\luizi\ontology-ts-sdk\node_modules\ws\lib'
resolve 'utf-8-validate' in 'C:\Users\luizi\ontology-ts-sdk\node_modules\ws\lib'
  Parsed request is a module
  using description file: C:\Users\luizi\ontology-ts-sdk\node_modules\ws\package.json (relative path: ./lib)
  after using description file: C:\Users\luizi\ontology-ts-sdk\node_modules\ws\package.json (relative path: ./lib)
    resolve as module
      C:\Users\luizi\ontology-ts-sdk\node_modules\ws\lib\node_modules doesn't exist or is not a directory
      C:\Users\luizi\ontology-ts-sdk\node_modules\ws\node_modules doesn't exist or is not a directory
      C:\Users\luizi\ontology-ts-sdk\node_modules\node_modules doesn't exist or is not a directory
      C:\Users\luizi\node_modules doesn't exist or is not a directory
      C:\Users\node_modules doesn't exist or is not a directory
      C:\node_modules doesn't exist or is not a directory
      looking for modules in C:\Users\luizi\ontology-ts-sdk\node_modules
        using description file: C:\Users\luizi\ontology-ts-sdk\package.json (relative path: ./node_modules)
        after using description file: C:\Users\luizi\ontology-ts-sdk\package.json (relative path: ./node_modules)
          using description file: C:\Users\luizi\ontology-ts-sdk\package.json (relative path: ./node_modules/utf-8-validate)
            no extension
              C:\Users\luizi\ontology-ts-sdk\node_modules\utf-8-validate doesn't exist
            .ts
              C:\Users\luizi\ontology-ts-sdk\node_modules\utf-8-validate.ts doesn't exist
            .js
              C:\Users\luizi\ontology-ts-sdk\node_modules\utf-8-validate.js doesn't exist
            as directory
              C:\Users\luizi\ontology-ts-sdk\node_modules\utf-8-validate doesn't exist