iii 1.0.0

Simple configuration library,Easier than .ini
Documentation 
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# iii

#### Introduce
Simple configuration library,Easier than .ini

#### Config file format

##### default.iii
~~~
c1 = value
#2222
c2 = value2
c3 = ccc3
c5 = 5c
~~~

##### Create new config file
~~~rust
let mut cc = BufData::new();
cc.chgvalue("c1", "value");
cc.chgvalue("c2", "value2");
cc.chgvalue("c3", "value3");
if let Ok(_) = cc.save(None){
    println!("file write success")
};
~~~
#### Read config file and save
~~~rust
if let Ok(mut cc) = BufData::loadfromiii("default.iii"){
    cc.chgvalue("c3", "ccc3");
    cc.chgvalue("c5", "5c");
    if let Ok(_) = cc.save(None){
        println!("file write success")
    };
};
~~~
#### Read value by key
~~~rust
if let Ok(cc) = BufData::loadfromiii("default.iii"){
    if let Some(v) = cc.getvalue("c2"){
        println!("K:{},V:{}","c2",v);
    }
    if let Some(v) = cc.getvalue("c5"){
        println!("K:{},V:{}","c5",v);
    }
};
~~~

#### Save config file
~~~rust
let mut cc = BufData::new();
cc.chgvalue("c1", "value");
if let Ok(_) = cc.save(None){
    println!("file write success")
};
if let Ok(_) = cc.save(Some("file1.iii")){
    println!("file write success")
};
~~~